Sometimes stuff is broken and we just haven't fixed it quite yet. Situations like this are listed here below for your perusal and personal comfort.
Please also see the Changelog for recently deployed fixes and improvements.
- Account binding is not yet available. Whilst you can sign in with either Xbox or Steam, once signed in it is not yet possible to then bind a 2nd gaming account. If you already had an account from earlier versions of the site with multiple gaming accounts connected, then they will all sync - but it is not yet possible to connect a new one. But, you can sign out, then sign in with the other one - and once this issue is resolved the two will be joined together automatically.